It's not wrong to need her or want her to care about you. Wants and needs are fine, but when we
expect our needs/wants to be met, that's when we tend to get in trouble. That's when we start to infringe on the rights of others. That said, you do seem to have a good handle on that concept (especially for your age...I thought the world existed to please me at that age).
But now you have a choice to make. Can you accept this feeling of betrayal and continue on or is this going to eat at you long term? Here's the kicker, it's not something you're going to know today or tomorrow. You can decide to make that decision today (yes, I actually said that

) or wait. It's all in your hands.
May not be what you wanted to hear, but I truly hope you can do what's best for you!